/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Change the order of variables in the Blueprint
static bool MoveVariableBeforeVariable ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, [UStruct](API\Runtime\CoreUObject\UObject\UStruct) * VariableScope, [FName](API\Runtime\Core\UObject\FName) VarNameToMove, [FName](API\Runtime\Core\UObject\FName) TargetVarName, bool bDontRecompile )